to no avail

Her efforts were to no avail.

Ses efforts furent vains.

To no avail.

En vain.

— The White Ribbon (2009)

I removed my mask as a gesture of remorse but my it was to no avail.

J'ai retiré mon masque en signe de remords, mais en vain.

— Don Juan DeMarco (1994)

All the efforts of the doctors were to no avail.

Tous les efforts des médecins furent vains.

They searched high and low for the missing boy but to no avail.

Ils ont cherché partout le garçon disparu, mais en vain.

We have discussed the problem several times but to no avail.

Nous avons discuté du problème à plusieurs reprises, mais sans succès.

I have tried to overcome my shyness, but to no avail.

J’ai essayé de surmonter ma timidité, mais en vain.